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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3174d1645d1bc04f8b25e54403437cd743a67caa16bf56c1ba85cb7a0ed676' 
  AND token = 'KWJG3/LIMHt3Q6sizQFmPKPRuycupEPKVX+xsJAR7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}